target/linux/bcm27xx/patches-5.15/950-0525-dwc_otg-pay-attention-to-qh-interval-when-rescheduli.patch

   1 From 4e27de0597024fd7070c04a1bf0af82f1be77191 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.com>
   3 Date: Wed, 6 Oct 2021 15:27:53 +0100
   4 Subject: [PATCH] dwc_otg: pay attention to qh->interval when
   5  rescheduling periodic queues
   6
   7 A regression introduced in https://github.com/raspberrypi/linux/pull/3887
   8 meant that if the newly scheduled transfer immediately returned data, and
   9 the driver resubmitted a single URB after every transfer, then the effective
  10 polling interval would end up being approx 1ms.
  11
  12 Use the larger of SCHEDULE_SLOP or the configured endpoint interval.
  13
  14 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
  15 ---
  16  drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  20 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  21 @@ -691,7 +691,7 @@ int dwc_otg_hcd_qh_add(dwc_otg_hcd_t * h
  22         } else {
  23                 /* If the QH wasn't in a schedule, then sched_frame is stale. */
  24                 qh->sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd),
  25 -                                                       SCHEDULE_SLOP);
  26 +                                                   max_t(uint32_t, qh->interval, SCHEDULE_SLOP));
  27                 status = schedule_periodic(hcd, qh);
  28                 qh->start_split_frame = qh->sched_frame;
  29                 if ( !hcd->periodic_qh_count ) {